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==== Report for the week of 2/18 ==== ==== Report for the week of 3/4 ====
 * On Monday, Mark helped Aso-san with PR3, and Monday, Tuesday and Wednesday, Fabian helped Fujii-kun with PRM.
 * Mark and Terrence attempted to offload some BS IM/IRM yaw adjustments that had been done by Enomoto-san last Friday. They rezeroed the OL and then opened the tank lid and did a compensating adjustment to the F0 yaw stepper, then undid the IM/IRM yaw with the pico. However this did not have the desired effect, probably because the buoyancy correction had not been cancelled when Enomoto-san was working and the BF keystone was very high, with the IM-V OSEMs way too far in and possibly touching. We did our best to back out all the adjustments but the roll TFs were still messy and there were signs that the IM was not free in yaw (the IM/IRM Y varied oppositely to IP Y, indicating that the IMR was free and the IM wasn't). We ended up deciding to have Mirapro remove the ducts on the ±X sides of the tank so we could go in and inspect.
 * Terrence tuned the SR3 LEN OL to be free of yaw cross-coupling.
 * Terrence and Enzo did a full set of filters and a Guardian for SR2 and SR3.
 * Terrence did health checks on SR2 and SR3.
 * Enzo measured mode Qs.
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 * On Friday and Saturday last week the pump down of the central area took place. We monitored the drift in the four Type B IPs.
 * During the week we recovered the four suspensions successfully: we recovered the alignment of IMs, GAS filters, IPs, oplevs and measured TFs.
 * Terrence, Enzo and Mark installed the length sensing components in SR2 oplev. It's working now and we should use it now to measure the optic's corresponding TF.
 * The SRM IM is still drifting but the speed is decreasing. Yesterday Thursday the speed was '''-81 nrad/min'''. With the aim of predicting when the drift may stop Terrece removed offsets from the time series segments and spliced them in order. The work is still on progress.
 * Terrence did more work in changing the real-time models.
 * Mark did some initial debugging on the stepper reset system, starting with SRM. However there seems to be some model-related problem. A BIO Checker Board gave sensible results for the low 32 bits of DIO card #0 (used for the TM LPCD) but nothing for the high 32 bits (used for steppers, and eventually also the WD). He added the stepper reset stuff to the circuit diagram (D1503660) and made other corrections.

==== Plan for week of 2/25 ====
 * Mark from Tuesday.
 * Enzo from Monday lunchtime.
 * Continue debugging stepper reset system.		 ==== Plan for week of 3/11 =====
 * Mark at Kamioka full week.
 * Enzo at Kamioka Mon, Tue, then JPS.
 * Hirata-san at Kamioka from Monday lunchtime through Friday.
 * Fix BS.
 * Final test of stepper remote enable system (someone in cleanroom checks the lights go on/off).
 * Install/test hardware watchdogs.
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 * Install new RTMs and Guardian.
 * Debug SRM geophones.
 * Setup SRM and SR3 LEN OLs (low priority).		  * More mode Q measurements.
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 * Enzo vacation, 3/5 and possibly 3/6.
 * Enzo et al. Farewell Party, 3/7.

Scraps of text for incorporation in the VIS Meeting Minutes

KAGRA/Subgroups/VIS/MeetingNAOJ

Type B (Mark)

Report for the week of 3/4

  • On Monday, Mark helped Aso-san with PR3, and Monday, Tuesday and Wednesday, Fabian helped Fujii-kun with PRM.
  • Mark and Terrence attempted to offload some BS IM/IRM yaw adjustments that had been done by Enomoto-san last Friday. They rezeroed the OL and then opened the tank lid and did a compensating adjustment to the F0 yaw stepper, then undid the IM/IRM yaw with the pico. However this did not have the desired effect, probably because the buoyancy correction had not been cancelled when Enomoto-san was working and the BF keystone was very high, with the IM-V OSEMs way too far in and possibly touching. We did our best to back out all the adjustments but the roll TFs were still messy and there were signs that the IM was not free in yaw (the IM/IRM Y varied oppositely to IP Y, indicating that the IMR was free and the IM wasn't). We ended up deciding to have Mirapro remove the ducts on the ±X sides of the tank so we could go in and inspect.
  • Terrence tuned the SR3 LEN OL to be free of yaw cross-coupling.
  • Terrence and Enzo did a full set of filters and a Guardian for SR2 and SR3.
  • Terrence did health checks on SR2 and SR3.
  • Enzo measured mode Qs.

==== Plan for week of 3/11 =====

  • Mark at Kamioka full week.
  • Enzo at Kamioka Mon, Tue, then JPS.
  • Hirata-san at Kamioka from Monday lunchtime through Friday.
  • Fix BS.
  • Final test of stepper remote enable system (someone in cleanroom checks the lights go on/off).
  • Install/test hardware watchdogs.
  • Continue monitoring SRM yaw drift.
  • More mode Q measurements.
  • Work on Type B paper.

Vacation/Travel Info

  • Enzo at JPS then final vacation, 3/13-29
  • Terrence's last day, 3/29.

KAGRA/Subgroups/VIS/TypeB/Minutes (last edited 2022-10-28 10:02:46 by fabian.arellano)